S57FF — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Slovenia Most frequent locator attributed to this token: JN76

Receiver-side FT8 activity involving S57FF, decoded by SO8OO in southeastern Poland. 518 FT8 messages attributed to this token as transmitter, on 20m, across 13 UTC dates in the available aggregate history. Observed between 2026-07-01 and 2026-08-30.

These are automated observations at the SO8OO receiver, not an official contact log. Times are UTC. Attribution follows decoded FT8 message structure: CQ uses the first token and directed-looking messages use the second. Free text that resembles a directed message can be attributed imperfectly. Summary S/N reflects propagation plus SO8OO receiver, antenna and local-noise conditions. Counts are not adjusted for monitoring outages; transmissions that were not decoded are absent. Inferred entity and location data may be inaccurate for portable, remote or special-event operation.

SO8OO decoded 518 FT8 messages attributed to S57FF as the transmitting token by decoded message structure across 13 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Most decodes (69%) fell within the six-hour window 15:00-21:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (69%); the estimated median was -5 dB.

Overview

518
Messages attributed
13
UTC dates decoded
55
Active 15-min windows
-5 dB
Estimated median S/N

Bands

20m · 518
First attributed message: 2026-07-01
Last attributed message: 2026-08-30 12:33 UTC

Observed FT8 message patterns

Attributed sample
518 messages
Active dates
13 UTC dates
Estimated median S/N
-5 dB
Estimated 10th-90th percentile
-14 to +3 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 38, moderate (-15 to -9 dB) 122, strong (≥ -8 dB) 358.

WSJT-X defines S/N reports against a 2,500 Hz reference noise bandwidth. The ranges above are SO8OO receiver-side display categories, not official WSJT-X classes, transmitter-power measurements or estimates of how easy the station is to hear elsewhere. Statistics include only successful decodes on SO8OO's monitored FT8 channels; transmissions that were not decoded are absent.

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with S57FF in decoded directed-looking exchanges:

Attributed messages by UTC hour

Rolling 90-day UTC chart window. Counts follow decoded message structure: the first token for CQ, or the second token in a directed-looking message.

Most frequent locator attributed to S57FF

The map compares the centres and boundaries of the locator field attributed to this token by decoded message structure, 2° × 1° as a Maidenhead square, and SO8OO's six-character receiver square. The separation is not an exact antenna-to-antenna distance or a radio-path length.

Attributed locator
JN76 · 213 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
631 km (approx.)
Last such locator decoded
2026-08-30 12:33 UTC

A decoded locator can describe portable, remote or special-event operation and is not proof of a permanent station address or transmitter identity.

Observed FT8 exchanges

S/N cells show: decoded at SO8OO / report transmitted by the counterpart. An observed exchange is not a QSL or an official logbook confirmation.

Time UTCBandS57FF S/NCounterpartCounterpart S/NMsgsCapture
08-30 12:32 20m -10 / - DH8KAM - / - 2 Partial capture
08-30 12:27 20m - / -17 R6OV -11 / - 2 ✓ Closing fragment
08-30 12:19 20m +2 / - LB8TG 0 / 0 4 ✓ Full exchange observed
08-30 12:15 20m +3 / -1 RM6OS -14 / -12 5 ✓ Full exchange observed
08-30 12:12 20m -6 / -13 RO6OP 0 / -7 5 ✓ Full exchange observed
08-29 20:57 20m - / -11 EA8ACW +7 / - 2 ✓ Closing fragment
08-29 20:16 20m +9 / -11 EA5HPF +10 / +3 5 ✓ Full exchange observed
08-29 20:14 20m +7 / - EA3HRE - / - 3 Partial capture
08-29 20:12 20m +5 / - PT7BI - / +1 3 ✓ Closing fragment
08-29 19:38 20m +8 / +8 EA2WX -12 / +9 5 ✓ Full exchange observed
08-29 19:37 20m +1 / - EA4IDN - / -4 3 ✓ Closing fragment
08-29 19:34 20m 0 / - EA7GNO - / -1 3 ✓ Closing fragment
08-29 19:26 20m +4 / - WP4LFS - / -8 9 Partial capture
08-29 19:25 20m -3 / -4 EA1FAW +4 / - 3 Partial capture
08-29 19:23 20m -1 / - F5PBG - / -3 4 Partial capture
08-29 19:21 20m +3 / +1 AO5FSB +2 / - 5 ✓ Full exchange observed
08-29 19:20 20m -1 / - EA1FAW - / - 2 Partial capture
08-29 19:17 20m -6 / - UA6XDA - / - 2 Partial capture
08-29 19:16 20m 0 / - YC7NFT - / - 2 Partial capture
08-29 19:15 20m -6 / - UF4S - / - 3 Partial capture
08-29 19:12 20m -1 / - R4FDK - / - 3 Partial capture
08-29 19:11 20m -14 / - UF4S - / - 2 Partial capture
08-29 19:08 20m -2 / - RL4R - / - 3 ✓ Closing fragment
08-28 18:46 20m - / -1 UA3SNB +8 / - 2 ✓ Closing fragment
08-28 18:43 20m - / -7 JA2ODB -20 / - 2 ✓ Closing fragment
08-28 18:34 20m - / -10 R3YAR -2 / - 2 ✓ Closing fragment
08-25 01:12 20m - / -8 HC5RF -10 / - 2 ✓ Closing fragment
08-25 01:01 20m - / -16 WP4JKT -6 / - 2 Partial capture
08-15 20:25 20m -11 / - OZ5ESB/LH - / -8 3 Partial capture
08-15 20:22 20m -18 / - 7Z1DX - / -8 3 Partial capture
08-15 19:22 20m - / -4 CS8ABF -9 / - 3 ✓ Closing fragment
08-15 18:53 20m -12 / - G3ZRN -13 / +7 3 ✓ Closing observed
08-15 18:42 20m - / -5 EA4IVO/P -14 / - 3 ✓ Closing fragment
08-15 18:42 20m - / - F5NNN -10 / - 3 Partial capture
08-12 16:35 20m -11 / - WI1U - / -18 3 ✓ Closing fragment
08-12 16:31 20m -19 / - UA3RCW - / -9 3 ✓ Closing fragment
08-12 16:30 20m -10 / - F1USO - / - 2 Partial capture
08-12 16:27 20m -12 / - RY4AAE -21 / - 3 ✓ Closing observed
08-12 16:23 20m -10 / - YO3WST - / 0 3 ✓ Closing fragment
08-12 16:02 20m -18 / - PD5RAY - / +7 2 ✓ Closing fragment
08-12 15:59 20m -2 / - ON3GMB - / -7 2 Partial capture
08-12 15:57 20m -10 / - DC9FN - / -7 4 ✓ Closing fragment
08-12 15:54 20m -4 / - DG3KCW -6 / +3 4 ✓ Full exchange observed
08-12 15:53 20m -7 / 0 F5NBQ -5 / - 6 ✓ Full exchange observed
08-12 15:52 20m -17 / +4 DA1MHH -17 / +7 5 ✓ Full exchange observed
08-12 15:49 20m -10 / - M0KVI/P - / -6 3 ✓ Closing fragment
08-12 15:45 20m -12 / - PD1GF - / -2 5 ✓ Closing fragment
08-12 15:44 20m -15 / - CR5VP -21 / - 2 ✓ Closing observed
08-12 15:32 20m - / +4 HB9TWU -11 / - 2 ✓ Closing fragment
08-09 18:00 20m - / -15 PD0WRT -17 / - 3 Partial capture

Recent FT8 messages decoded at SO8OO

Frequency values are decoder audio offsets in hertz, not RF frequencies.

20m 
UTC    dB Audio  Message
121545  +2 2300  RM6OS S57FF R-12
121600 -11 2299  S57FF RM6OS -01
121615  +4 2299  RM6OS S57FF R-12
121630 -20 2299  S57FF RM6OS RR73
121915  +1 2109  S57FF LB8TG +20
121930  +4 2109  LB8TG S57FF R+00
121945  -1 2109  S57FF LB8TG RR73
122000  +0 2109  LB8TG S57FF 73
122100  -5 2109  M7KMN S57FF -14
122130  -8 2109  A41ZZ S57FF R-24
122600  -8 2264  F1UNR S57FF 73
122700 -11 1981  S57FF R6OV -17 (x2)
123245 -10 1217  DH8KAM S57FF JN76 (x2)

Decoder S/N history by band

Count-weighted daily averages across messages attributed to this profiled token and successfully decoded at SO8OO, limited to the rolling 90-day UTC chart window.

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